Page 21.12 Chapter 21 Environment Control R66 Maintenance Manual SEP 2012
21-32 Muffler Assembly
Refer to R66 Illustrated Parts Catalog (IPC) Figure 21-35.
A. Removal
1. Refer to Section 6-70. Remove hardware securing F794-1 and F794-2 (belly cover)
panels and remove panels.
2. Refer to Figure 21-3. Loosen B277-12 clamp and pull A785-39 hose off of G400-2
muffler assembly. Install temporary covers on muffler and hose openings.
3. Loosen G391-4 line assembly B-nut at AN824-8D tee; disconnect G391-2 and -4
line assemblies from muffler.
4. Remove hardware securing MS21919WCH32 clamps and muffler to forward right
keel panel and remove muffler. Plug & cap fittings. As required, remove clamps
from muffler.
B. Installation
1. Refer to Figure 21-3. As required, install MS21919WCH32 clamps on G400-2
muffler assembly. Install hardware securing clamps and muffler to forward right keel
panel. Verify security.
2. Remove caps and plugs and connect G341-2 and G341-4 line assembly B-nuts
to muffler assembly fittings. Special torque B-nuts at AN824-8D tee and muffler
assembly, and torque stripe per Figure 5-1.
3. Remove temporary covers and slide B277-12 clamp and A785-39 hose onto muffler
assembly and tighten clamp. Verify security.
4. Install (belly cover) panels, and install hardware. Verify security.
21-33 Diffuser and Tee Assemblies
Refer to R66 Illustrated Parts Catalog (IPC) Figure 21-33.
A. Forward Diffuser and Tee Assembly Removal
1. Refer to Figure 21-3. Remove screws attaching upper console to lower console and
hinge console aft. Protect instrument face with foam support or equivalent.
2. Loosen two B277-24 clamps securing G400-1 tee assembly collars to G400-7 and
G400-8 diffuser assemblies. Slide diffusers outboard from tee and lower console
assembly.
3. Loosen B277-12 clamp securing A785-39 hose to tee assembly can weldment and
pull hose and clamp off of can.
4. Remove hardware securing MS21919WCH16 clamp and tee assembly to angle and
remove tee. As required, remove clamps from tee.
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